G^＊积分理论求解应力强度因子及有限元法验证  

STRESS INTENSITY FACTORS OF PERIODIC CRACKS IN PIPES FROM G ^＊ -INTEGRAL THEORY AND VALIDATED BY FINITE ELEMENT METHOD

作　　者：孔令超[1] 

机构地区：[1]上海应用技术学院机械与自动化工程学院,上海200235

出　　处：《机械强度》2008年第1期157-161,共5页Journal of Mechanical Strength

摘　　要：利用G*积分理论求解管道裂纹应力强度因子。再应用ANSYS有限元分析软件,计算出纯弯曲、三点弯对称环向穿透裂纹和拉伸周期裂纹的应力强度因子。将应力强度因子的G*积分解与有限元解相比较,它们的相近验证了G*积分理论的适用性。Based on G^＊ -integral theory, stress intensity factors of circumferential double edge-like cracks under pure bending, three-point bending in pipes were estimated. Similarly, stress intensity factors of circumferential periodic cracks under tension in pipes were deduced. In the three cases, stress intensity factors were computed by finite element method grounded on J-integral theory. The resuits from G^＊ -integral theory were much close to those from finite element method, which further proved G^＊ -integral theory is simple, precise and widely applicable in the estimation of stress intensity factors.

关 键 词：G^＊积分 能量释放率 应力强度因子 有限元法 裂纹管道 断裂 

分 类 号：O346.1[理学—固体力学] TB115[理学—力学]